New process recovers secondary Pt metals. IN: Engineering and Mining Journal (E&MJ) ; v. 177, n. 6, 1976, p. 290. Mines Journal stacks (TN 1 .E53 v.177 Jan.-June) Yopps, D. L. and E. G. Baglin Extracting platinum-group metals from stillwater complex flotation concentrate by a two-stage bacterial oxidation/chemical treatment process/ by D.L. Yopps and E.G. Baglin. Warrendale, Pa. : Minerals, Metals & Materials Society, 1991. IN: Engineering Foundation Conference (1991 : Santa Barbara, Calif.). / Mineral bioprocessing, p. 247-260.